Electric and pneumatic governor.



PATENTED SEPT. 1, 1908.

W. K; RANKIN. ELECTRIC AND PNEUMATIC! GOVERNOR.

APPLICATION FILED D30. 11, 1907.

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W. K. RANKIN. ELECTRIC AND PNEUMATIC GOVERNOR.

APPLIGATIO N FILED DE(J.11, 1907.

ARMATURE PATENTED SEPT. 1. 190a.

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UNITED STATES PATENT orFIcE WILLIAM K. RANKIN, OF PHILADELPHIA, PENNSYLVANIA, ASSIG-NOR TO JOHN E. REYBURN, OF PHILADELPHIA, PENNSYLVANIA.

ELECTRIC AND PNEUMATIC GOVERNOR.

Specification of Letters Patent.

Patented Sept. 1, 1908.

Application filed December 11, 1907. Serial No. 406,003.

T all whom it may concern:

Be it known that I, WILLIAM K. RANKIN, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented new andv useful Improvements in Electric and Pneumatic Governors, of which the following is a specification.

This invention is for the control of an electrically driven motor-compressor for the accumulation of pneumatic pressure for the operation of brakes for railway cars. The governor being operative upon an accumulation of maximum pneumatic pressure to break the circuit to the 1notorcompressor, and to make the circuit upon a predetermined decrease of said pressure, thus governing the pneumatic pressure effective for brake purposes.

The governor is attached to the motorcompressor, and connected to the air reservoir, and means are provided whereby the governor automatically makes and breaks the circuit to the motor-compressor. As the governor is closely attached to the motor compressor there is less wiring than where they are detached, and remotely placed on the car, thus avoiding the troubles incident As the means to limitthe decrease of pneumatic pressure to a minimum can be finely adjusted the governor is extremely sensitive, and an assured sufficient pressure is always available for effective brake purposes. The making and breaking of the circuit is instantaneous.

The details of construction and operation are more fully set forth in the specification, and illustrated in the accompanying drawings, wherein similar reference characters indicate the same parts throughout the views, in which Figure 1 is an elevation view of the governor attached to the motor-compressor filed Feb. 15, 1906, number 301,151 and allowed June 29, 1907. Fig. 2 is an elevation at the side attached to the motor-compressor, the attachment being omitted. Fig. 3 is a ver tical central section on line x ac Fig. 2. Fig. 4 is a half view at the side connected to the air reservoir. Fig. 5 is a side view of'the attachment to the motorcompressor. Fig. 6 is a view of the coned disk and the minimum pressure regulating lever, as seen from the center of the governor, the brushes and insulation being removed. Fig. 7 is an edge view of the coned disk and the minimum pressure regulating lever, and a section on line I) Fig. 2. Fig. 8 is a diagrammatical view showing the electrical circuits.

At the reservoir side of the governor there is a plate 1., having a pipe connection 2 adapted to permit pressure from the air reservoir (not shown) to actuate diaphragm 3 in pocket 4 in plate 1, the diaphragm being secured by an annular ring 5 and bolts 6. Central in the ring is a plunger 7 against which a bar 8 is forced by springs 9, 1O having outer seats 11, 1.2 with adjusting screws 13, 14 tapped into the seats, and by this means diaphragm 3 may be made to resist a desired maximum pressure from the air reservoir. Plunger 7 has a hub 15 over which bar 8 passes, and the hub 15 abuts another hub 16 of friction disk 17 having an outer cone 18. The disk 17 and its hub 16 are journaled for free rotary movement. on a central spindle 19 screw threaded in hub 15, having a collar 20 let in flush in cone 18 and having an outward extension 21 therefrom. Opposite plate 1 there is a similar size plate 22 secured to plate 1 by bolts 23 screwed into the plate having collars 24 and at plate 1 nuts 25 and jam nuts 26. I/Vithin plate 22, and freely rotatable therein there is a sleeve 27 having an inner flange 23 and an internal coned seat 29, the sleeve being secured by an exterior plate 30 abutting case 31 of the motor, with a projection 32 fitting within a recess 33 of the motor case. Attached to plate 30 there are projecting pins 34 entering suitable pockets in the end of the motor shaft 35, and by which the sleeve 27 is rotated by the motor. Spindle extension 21 is j ournaled in sleeve 27. Attached to friction disk 17 there is a mica disk 36 carrying the rotatable brushes 37., connected by a ribbon conductor 38 (see Fig. 8). Brackets 39 secured to plate 22 carry springs 40 to which are secured brushes 41, adjustable by screws 42, and to these brackets+conductor 43 and conductor 44 are attached. Pins 45, 46 in plate 22 and pin 47 in friction disk 17 limit the rotatable movement of the disk and the attached brushes.

A minimum pressure lever 48 is fulcrumed. at 49 in a recess 50 in plate 22, it has a spring 51, an adjusting screw 52, and a projection 53 adapted to engage a notch 54 in disk 17. An eye 55 is fastened in hub 16 and thereto is secured a spring 56 having its opposite end attached to a support 57. The motor rotates sleeve 27 in the direction of the arrow seen in Fig. 2, and the cone-disk 17 18 the same way when it engages sleeve 27.

The operation of the governor is as follows: As illustrated, the diaphragm 3 is seated, as when minimum pressure is reached, cone 18 is free from friction ala'otatable contact with seat 29 of sleeve 27, notch 54 and projection 53 are disengaged and. spring 56 has rotated disk 17 to form the contact of brushes 37, 41, and current is lowing to the motor-compressor, which is rotating sleeve 27. As the motor-compressor accumulates maximum pneumatic pressure diaphragm 3 and plunger 7 will force, cone 18 into -frictional-rotatable contact with cone seat 29 of sleeve 27 overcome spring 56 and projection 53 will engage notch 54, the circuit being 110w broken and the motor-compressor stopped. Lever 48 can be adjusted so that the variations between maximum and minimum pneumatic pressures may be very slight.

I claim.

1. The combination with a motor-compressor of an electric-pneLunatic governor having an internally coned sleeve attached to and rotatable by the motor; a diaphragm operative by pneumatic pressure; a rotatable disk and a cone therefor adapted to engage the coned sleeve by the pressure on the diaphragm; brushes electrically connected and attached tothe disk; and brushes having electrical conductors and adapted to contact F with the disk brushes when the disk is rotated, and form an electrical circuit.

2. In an electric-pneumatic governor, a rotatable sleeve adapted to engage and be rotated by the armature shaft of a motor compressor; a coned seat within the sleeve; a disk and brushes thereon, and having a cone adapted to 'frictionally engage the coned seat aforesaid; a dia ')hragm operatively connected to the disk and its cone, having connec. tion. to an air reservoir, and whereby the air pressure eperatesthe diaphragm to force the cone into frictional contact with the coiled. seat of the rotatable sleeve.

3. In an electricpneumatic governor, a rotatable sleeve having an internal coned seat, and means to rotate the sleeve; a rotatable disk having a cone, and brushes attached thereto, with electrical connection between the brushes; stationary brushes with adjustable means for contact with the disk brushes, and electrical conductors thereto and therefrom; a diaphragm operatively connected to the rotatable disk; resilient means to force the diaphragm to resist a desired degree of pneumatic pressure; means to introduce said pressure against the diaphragm and frictionally engage the cone and the coned seat to thereby rotate the cone and break the circuit; and means upon the disengagement of the cone to the coned seat, by a decrease of pneumatic pressure, to oppositely rotate the disk and its brushes and make the circuit.

4-. in an electric-pncLunatic governor, a rotatable .and interi'ially coned sleeve, and means for its rotation; a coned disk adapt d to engage the sleeve for rotation, and means to limit the degree of rotation; a diaphragm subjected to pneumatic pressure; a plunger with resilient means to force it against the diaphragm, and connections to the coned disk for its engagement with the sleeve when the diaphragm is subjected to maximum pressure; electrically connected brushes on the disk; fixed brushes with adjustments, conductors thereto and therefrom, and adapted to form a circuit with. the disk brushes; a minimum pressure lcver having adjustments, engaging the coned disk when the circuit is broken, and until a desired inininnnn pi'ienmatic pressure is obtained; and resilient means to rotate the disk and againv form. the circuit when. the disk is free from the minimum pressure lever.

5. in an elcctric-pnenmatic governor, a diaphragm subjected to pneumatic pressure; a plunger and adjustable resilient means to force it against the diaphragm for a maximum pressure; a coned disk, connected to the plunger, rotatable on said connection, and circuit brushes thereon; lixcd brushes with positive and negative conductors; resilient means to rotate the disk and form a circuit; a rotatable sleeve having a coned scat adapted to engage the cone of tae disk and break the circuit; and an adjustable minimum pressure lever adapted to engage and retain the coned disk and its brushes out of circuit until a minimum prearrzmged pressure against the diaphragm is reached.

6. In an electric-pncumatie governor; a diaphragm subjected to pneumatic pressure: means to adjust the diaph 'agm to a desired maximum pressure; a disk rotativelv mounted and operatively connected to the diaphragm l'orcoacting reciprocating movement, and carrying electrically connected brushes; stationary brushes with adjustments and having positive and negative (ainducl'ors: a rotatable sleeve with means for its rotation, and means whereby it engages the disk aforcsaid for rotary movement and the breaking of the circuit when the diaphragm is subjected to maximum pressure; means to continue the break until a desired minimum is produced against the diaphragm; and means operative at the time the said minimum pressure is reached to oppositely rotate the disk and form the circuit.

In testimony whereof l allix my signature in presence of two witnesses.

Wllililiihl ii. hiANlilN.

\Vitnesses:

li. WVRIG'H'I, TILLIA'M (I. Sironvnn. 

